That's not the idea behind index funds. It's arithmetic. The aggregate return of active investors, before fees, is the market return. Once you subtract fees, it's below the market return. While some active managers' performance less fees is higher than the market return, it's very difficult to predict which will perform this way. So your best bet is to own the market through a broad index fund that has almost no cost.
If you want to read about this, see Sharpe (1991), The Arithmetic of Active Management.
If you want to read about this, see Sharpe (1991), The Arithmetic of Active Management.